this is the latest stop on the twisted path searching for jimmy hoffa. investigators are in that shed, gathering a soil sample to see if the mystery of jimmy hoffa rests here. more than 37 years after jimmy hoffa vanished without a trace, the trail led to this suburban home. an informant claims he saw a body buried here around the time hoffa went missing. first told the author of "the hoffa wars." >> he is adamant that he is buried at this location. >> reporter: he directed him to the local police. >> we believe the witness did observe something and we felt credible enough to take the investigation to this point. >> reporter: using ground penetrating radar, authorities found signs of something about two feet under the driveway. today, they'll take a soil sample to look for evidence of human remains. hoffa was last seen outside a detroit restaurant in 1975, apparently lured by two mob figures. since then, the search has taken investigators to northern michigan, to giants stadium in new jersey, and to a farm outside detroit where in 2006 the fbi raised a 3